Groove grinding machine



Aug. 21, 1934. c. BROWN 1,970,733

' GROOVE GRINDING MACHINE Filed Jan. 6, 1934 3 Sheets-Sheet l CHI?! 5 TOPHER 5n OWN- BY 1 iw AITORNEW.

Y Aug. 21, 1934. 0. BROWN GROOVE GRINDING MACHINE 5 Sheets-Sheet 2 Filed Jan. 6, 1954 INVENTOR CHQ/STOPHER BROWN.

LETE'iLJ r ATTORNEYS.

Aug. 21, 1934.

C. BROWN GROOVE GRINDING MACHINE Filed Jan. 6, 1934 3 Sheets-Sheet 3 INVENTOR CHE/S 7-0 PHEI-E' BRQ w N- BY jki Patented Aug. 21, 1934 Y ?UNlTEDSTAT-ES EN GROOVE GRINDING MACHINE Christopher Brown, Ford City, Pa., assignor to I I Pittsburgh Plate Glass Company, a corporation of Pennsylvania Application January 6,

Claims.

The invention relates to a machine for grinding a curved groove in a strip of glass or other similar material, such as is often used as a molding or cove. Briefly stated, the machine comprises a =8- rotating driven grinding element in the form of a metal spindle having a cross section of the curvature to be produced in the strip of glass, marble, or the like, to be ground, and a table for carrying w the strip, such table being mounted for reciprocalO tion longitudinally of the bar, suitable power means being provided for rotating the bar and reciprocating the table. The invention has for its objects the provision of an improved apparatus of the character specified, which is very simple in construction; which is efficient in operation; and in which the steps of positioning and replacing of the material to be ground is accomplished by the operator easily and with a minimum loss of time. One embodiment of the invention is illustrated in the accompanying drawings, wherein:

Figure 1 is a plan view. Fig. 2 is a side elevation. Fig. 3 is an end elevation. And Fig. 4 is a section on the line IV-IV of Fig. 2. p Referring to the drawings, 1 is the frame of the 25 -machine, in the upper portion of which is mounted the grinding roll 2 supported in suitable bearings and driven from the motor 3 through the intermediary of the belt 4 passing around the pulleys 5 and 6. Lying beneath the grinding roll is the work support or table 7. This table is of the cross section indicated in Fig. 4 and is upon a shaft 8 mounted for endwise and rotative movement in the bearings 9 and 10 so that the table pivots with the shaft and moves endwise therewith when the shaft is reciprocated. The strip of glass 11 or other material to be grooved by the roll is carried by wooden blocks 12, 12, 12 which rest on the table.

In order to yieldingly press the strip 11 against the grinding roll 2, the table is provided with a pair of arms 13, 13, to which are hung the counterweights 14, 14, the arms being provided with a plurality of perforations 15 to permit of the adjustment of the counterweight so as to vary the -'-pressure of the material to be ground against the grinding roll.

The shaft 8 and table 7 carried thereby is reciprocated during the grinding operation from the crank disc 16 which is provided with a pin 17 on which is pivoted the connecting rod 18. The other end of this connectingrod is pivoted at 19 to a collar 20 carried by the shaft 8. The crank disc is driven from a motor 21 through the in- .termediary of reduction gearing in the casing 29 and the belt 22 which passes around pulleys 23 1934, Serial No. 705,535

and 24 carried respectively by the motor shaft and the shaft 30 of the gearing in the casing 29.

In order to prevent the table from moving up too far when the strip 11 is removed, a pair of stop members 25, 25 are employed which depend from 6 the edge of the table and are provided with hooked ends, as indicated in Fig. 3, which lie beneath the stop bar 26. During the grinding operation, a mixture of abrasive and water is supplied upon the grinding bar from suitable feeding means not shown, and in order to collect the waste abrasive and water, a pan 27 is provided beneath the table, such pan being provided with a suitable overflow pipe 28.

In operating the machine, the strip 11 to be 7 grooved is mounted upon the blocks 12, one of the arms 15 being held up at this time to permit the placing of the blocks and the strip 11. After the strip is thus positioned, the weight of the M counterweights 14 presses the strip 11 against the grinding roll with an amount of pressure which can be regulated by the position of the counterweights 14. The operation of the motor 3 rotates the grinding bar while the motor 21 in connection with the crank disc 16 and connection rod 18 causes reciprocation of the table during the grinding operation so that the work of grinding is properly distributed over the entire grinding area of the roll 2. After the grinding operation is completed, the work is readily released by raising one of the arms 15, at which time the strip 11 may be removed and another one substituted, thus completing the cycle.

What I claim is:

1. In combination in groove grinding apparatus, a horizontal driven grinding spindle, a work support below the spindle mounted for reciprocation longitudinally thereof, means whereby the work support is pressed yieldingly upward to cause the work on the work support to engage the spindle, and means for reciprocating the work support.

2. In combination in groove grinding apparatus, a horizontal driven grinding spindle, a work support below the spindle mounted for reciprocation longitudinally thereof, and counterweighted so that it is pressed yieldingly upward to cause the work on the work support to engage the spindle, and means for reciprocating the work support.

3. In combination in groove grinding apparatus, a horizontal driven grinding spindle, a shaft paralleling the spindle and mounted for pivotal and also endwise movement, a work support secured to the shaft and lying beneath the spindle, a counterweight for the work support on the side for;

fit

tudinally of the spindle, and means for giving the work support a reciprocating movement longitudinally of the spindle.

5. In combination in groove grinding apparatus, a horizontal driven grinding spindle, a shaft paralleling the spindle, a work support on one side of the shaft beneath the spindle and a counterweight therefor on the other side of the shaft carried thereby and movable about the center line of such shaft as an axis and also longitudinally of the spindle, stop means for limiting the upward movement of the work support, and means for giving the work support a reciprocating movement longitudinally of the spindle.

CHRISTOPHER BROWN. 

